Aromatic aisino sitlphochlosides



terial.

Patented May 30, 1933 UNITED STATES HUGO SCHWEITZER, WINFRID HENTBICH,

AND KARL BURR, OF WIESDORF-ON-THE- RHINE, GERMANY, ASSIG-NORS TO GENERAL ANILINE WORKS, INC., OF NEW YORK, i

I N. Y., A CORPORATION OF DELAWARE AnoMArro AMINO surrnocnnonrnns No Drawing. Application filed February 12, IBSOQSerial No. 427,988, and in Germany February 18, 1929.

The present invention relates to the manufacture of aromatic amino sulphochlorides and to the new products obtainable thereby, more particularly it relates to compounds of the probable general formula wherein R stands for a radical of the benzene or naphthalene series which may be substituted by any substituents, such as halogen, alkyl, hydroxyl, phenyl, substituted phenyl etc, and as stands for one of the numbers 1 and 2.

Our new compounds are prepared by causing chlorosulphonic acid to act on an amino sulphonic acid of the benzene or naphthalene series or a nuclear substitution product thereof. In carrying out-our invention the aromatic amino sulphonic acid is introduced into chlorosulphonic acid while cooling, and the reaction mass is allowed to stand for a time ranging from about 1 hour to severaldays at time and temperature required depending on' the amino sulphonic acid used as starting ma- In some cases our new reaction leads not only to the amino sulphochloride of the amino sulphonic acid used as starting material, but more sulphochloride residues or even chlorine atoms enter the molecule.

From the reaction mixture, the new sulphochlorides are isolated by pouring the mixture onto ice. After recrystallization the sulphochlorides form colorless to yellow crystalline substances which are soluble in organic solvents and, when boiled'with aqueous alkalies are saponified to form aromatic amino sulphonic acids. The new compounds may be used for the production of intermediate products for the manufacture of coal tar dyestufis, for the synthesis of pharmaceutical products, for the manufacture of auxiliary materials for dyeing and printing and also for combating insect pests.

The following examples illustrate our invention, without limiting it thereto "Example 1.-1O parts by weight of 4- chloro-aniline-3-sulphonic acid are gradually introduced while cooling into parts by weight of chlorosulphonic acid. After standing for one hour, the reaction mixture is slowly heated on the water bath to 80-90 C. and maintained at this temperature for 8 hours. On cooling it is poured onto a large quantity of ice, whereupon the d-chloroaniline-3-sulphochloride of the formula separates in the form of flakes. The latter are separated from the acid liquor by filtering and washing with ice water, dried on clay or filter paper and recrystallized from an appropriate solvent. The 4 chloroaniline-3- sulphochloride can also be separated from the acid liquor by extraction with ether, and the ethereal solution vcan be Worked up in the known manner.

The e-chloroaniline-3-sulphochloride forms colorless crystals, which gradually become colored. The compound is decomposed between about 80 and 90 C.

Example Q.From 10 parts by Weight'of 2.5-dichloroaniline-L-sulphonic acid and 30 parts by weight of chlorosulphonic acid 2.5- dichloroaniline-L-s u l p h o c h l or i d e of the formula chloroaniline-2-sulphonic acid and 40. parts by weight of chlorosulphonic acid yield when treated as above (Example 1) 4:.5-dichloroaniline-2-sulphochloride of the formula It forms pale yellowish colored crystals,

NHz

The compound forms coarse pale yellowish colored crystals, melting at about 8586 C.

Example 5.10 parts by weight of 2-chlo- J r 4 amino 1 methylbenzene--sulphonic acid yield, when treated with 60 parts by Weight of chlorosulphonic acid in the manner as indicated in Example 1, Q-chloro-el-amino-1-methylbenzene-5-sulphochloride of the formula It forms coarse yellowish crystals, melting at about 127128 C.

Example 61-10 parts by weight of B-chloro-2-amin'o 1 methylbenzene 5 sulphonic acid treated with 50 parts by weight of chlorosulphonic acid yield 3-chloro-2-amino- 1 methylbenzene 5 sulphochloride of the formula The compound forms yellowish colored crystals', melting at about Lil-152 C; immediately aboye this temperature decomposition occurs.

Ea/ ample '7.+10- parts by weightof 1.3-dimethyl- 4 aminobenzene 5 sulphonic acid treated as in Example 1, with 50 parts by weight of chlorosulphonic acid yield 1.3-dimethyl-4-aminobenzene-5-sulphochloride of the formula which compound forms yellow crystals, melting at about 8586 G.

Example 8. parts by weight of 1.8-phenylene-diamine-4.6-disulphonic acid yield, when treated with parts by weight of chlorosulphonic acid, 1.3-phenylene-diamine-4.6- disulphochloride of the formula lTIHz It forms small white needles, which decompose at about 185 C. after sintering.

Example .9.From 10 parts by weight of l-amino-3-hydroxybenzene-6-sulphonic acid and parts by weight of chlorosulphonic a c i d, 1-amino-3-hydroxybenzenel.6-disulphochloride of the formula is obtained in the form of small crystals,

possessing a silvery lustre and melting at about 181 C. with decomposition.

Example 10.VVhen 50 parts by weight of chlorosulphonic acid are caused to react as in Example 1, with 10 parts by weight of 1-naphthylamino-'l-sulphonic acid, l-naphthylamino-disulphochloride of the formula ITTHz is produced. It forms yellowish crystals which melt at about 216218 C. with decomposition.

Example 11.-50 parts by weight of aniline-o-sulphonic acid are introduced in small amounts in the course of about 2 hours while cooling into 250 parts by weight of chlorosulphonic acid. After standing for several days SO 2 Cl at ordinary temperature, for example, after- 7 2 hours, the reaction mixture is poured onto a large quant ty of 1ce,su1tably with the addition of an acid bindmg agent, such as, for

example, magnesium carbonate. Thereby the aniline-o-sulphochloride of the formula separates in the form of yellow flakes, which are taken up with ether and separated therefrom in known manner. They form yellow crystals, melting at about 72-7 4 0.

Example 12.-30 parts by weight of 2- amino-8-naphthol-3.ti-disulphonic acid are introduced in the course of one hour while cooling into 250 parts by weight of chlorosulphonic acid. The reaction mixture is allowed to stand for several hours at room temperature, and then the temperature is slowly raised to about 100 C. and kept at this temperature for about 7 hours. After cooling the mass is poured onto ice while stirring, whereupon the 2-amino-8-naphthol- 3.6-disu1phochloride separates in form of yellowish flakes. It is sucked ofl", Washed free from acid with ice water, dried and recrystallized from chlorobenzene. The yellow crystals thus obtained have no melting point, but become colored dark above 250 C.

The followin table shows some further compounds obtainable according to the present process From fi-chloroaniline-3- There is prosulphonic acid. d d

6 chloroaniline 3 sulphochloride: yellowish crystals (benzene) m. p. 77 80 C (chlorobenzene) m. p. 136C 1-ch10ro-2-naphthylaminofi-sulphochloride: yellow crystals (ether) in. p. 152- 153 C From l-chloro-2-naphthylamine-G-sulphonic acid.

There is produced.

1 amino dichloronaphthalene-4-sulphochloride: yellow crystals (ether) in. p. 204-205" C.

4.4 diamino dichlorodiphenyl 3.3 disulphochloride: colorless crystals (benzene) m. p. 76 C 4.4 diamino dichlorodiphenyl- 2.2 disulphochloride: colorless crystals (benzene) m. p. 132- 133" 0.

There is pro- From 1.2 aminonaphduced.

thoI-4-sulphonic acid.

From4.4-diaminodiphenyl 3.3 disulphonic acid.

There is produced.

From 4.4-diamino-diphenyl-2.2-disulphonic acid.

There is produced.

We claim V 1. The process which comprlses causmg chlorosulphonic acid to act upon an ammo naphthol sulphonic acid at a temperature ranging between about 15 C. and about the boiling point of the reaction mixture, for several hours.

3. As new products amino sulphochlorides which may be represented by the following general formula R-NHa wherein R stands for a radical of the benzene or naphthalene series, and as stands for one of the numbers 1 and 2, said compounds being generally colorless to yellow crystalline substances, soluble in organic solvents, being saponsified to form aminosulphonic acids when boiled with aqueous alkalies and being valuable intermediate products for the manu: facture of coal tar dyestuffs and pharmaceutical substances. 1

4:. As new products naphthylamino-sulphochlorides which may be represented by the following general formula R-NHa forming yellowish crystals, decomposing while melting at about 216 to 218 C.

6. As a new product, 2-amino-8-naphthol- 3.6-disulphodichloride, forming yellowish crystals which have no definite melting point but become dark colored when heated above 250 C.

In testimony whereof, we affix our signatures.

HUGO SCHWEITZER. WINFRID HENTRICH. KARL BURR.

sulphonic acid of the benzene or naphthalene V series at a temperature ranging between about 15 C. and about the boiling point of the reaction mixture, for several hours.

2. The process which comprises causing chlorosulphonic acid to act upon an amino- 

